Leonard Williams was the principal of the training school for Māori clergymen that Bishop Williams established at Waerenga-a-hika in Poverty Bay in September 1855. In 1862 Leonard was appointed to be Archdeacon of Waiapu.[7]

The First Taranaki War, from March 1860 until 1862 resulted in the East Cape and Poverty Bay area became increasingly unsettled. A ‘repudiationist’ movement developed in Poverty Bay. The Ngāti Kaipoho chief Raharuhi told Governor Thomas Gore Browne that the Māori did not recognise Queen Victoria’s claim to rule over them and that the lands which the settlers in Poverty Bay had obtained should be returned.[8]

The Pai Mārire (Hauhau) moved into Poverty Bay in March 1865. The Poverty Bay Māori were neither for nor against the Hauhau. While the Rongowhakaata iwi defended the mission, Bishop Williams lost confidence in the security of the mission when some chiefs provided support for the Hauhau and went to the Bay of Islands with is wife and daughters. However Leonard remained at the mission.[9]

The mission at Waerenga-a-hika became a battle ground and the buildings were destroyed. After the Hauhau were defeated the Māori in the Poverty Bay had a much reduced support for the Christian faith, although it was sustained where there were CMS missionaries and Māori clergymen.[10] Many Māori of the Urewera and Poverty Bay regions had adopted the Ringatu religion, which was framed in language taken from the Old Testament. Leonard Williams, travelled through the Ngāi Tūhoe country in 1878. He commented on the Ringatu religion: “Their manner was reverent and the petitions contained in their prayers were framed in language taken from the Old Testament, but the obvious objection to the whole system was that it was anti-Christian, being a deliberate rejection of all that the love of God has provided for sinners in Jesus Christ.”[11]

He was regarded as the most learned scholar of Māori culture. During his lifetime he reissued his father's publication, A dictionary of the New Zealand language twice, as well as publishing his own book introducing the Māori language and contributing to the study of New Zealand plants.[2] The dictionary was again reissued by his son, the Rt Revd Herbert Williams, who also followed Williams and his father as a bishop of the same diocese.

Williams became the third Bishop of Waiapu in 1895.[12] He would travel on horseback around his diocese accompanied by two assistants. Williams retired in 1909 when he found the job too difficult. He died at his home in Napier in 1916.[2]

^'Williams, William', from An Encyclopaedia of New Zealand, edited by A. H. McLintock, originally published in 1966. Te Ara - The Encyclopedia of New Zealand, updated 18-Sep-2007, accessed 9 January 2007